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Asset Retirement Obligations - Schedule of Changes in Asset Retirement Obligations (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
Balance at December 31, 2015 $ 35,812
Liabilities incurred during period 64
Liabilities settled during period (5)
Accretion expense during period 465 [1]
Revisions to estimates 571
Liabilities held for sale 73 [2]
Balance at March 31, 2016 $ 36,980
[1] Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statement of Operations.
[2] Represents the change in ARO related to the properties held for sale during the three months ended March 31, 2016. The total ARO related to the properties held for sale as of March 31, 2016 was $10.2 million (see Note 7 – Assets Held for Sale).